lbrypress/classes/LBRY_Admin_Notice.php

<?php
/**
* Class for logging and displaying admin notices
*
* @package LBRYPress
*/

class LBRY_Admin_Notice
{
    public function __construct()
    {
        add_action('admin_notices', array($this, 'admin_notices'));
    }

    /**
    * Displays all messages set with the lbry_notices transient
    */
    public function admin_notices()
    {
        if (get_transient('lbry_notices')) {
            $notices = get_transient('lbry_notices');
            foreach ($notices as $key => $notice) {
                $this->create_admin_notice($notice);
            }
            delete_transient('lbry_notices');
        }
    }

    /**
     * Sets transients for admin errors
     */
    // TODO: Make sure we only set one transient at a time per error
    public function set_notice($status = 'error', $message = 'Something went wrong', $is_dismissible = false)
    {
        $notice = array(
            'status' => $status,
            'message' => $message,
            'is_dismissible' => $is_dismissible
        );

        if (! get_transient('lbry_notices')) {
            set_transient('lbry_notices', array($notice));
        } else {
            $notices = get_transient('lbry_notices');
            $notices[] = $notice;
            set_transient('lbry_notices', $notices);
        }
    }

    /**
     * Prints an admin notice
     */
    private function create_admin_notice($notice)
    {
        $class = 'notice notice-' . $notice['status'];
        if ($notice['is_dismissible']) {
            $class .= ' is-dismissible';
        }
        printf('<div class="%1$s"><p>%2$s</p></div>', esc_attr($class), esc_html($notice['message']));
    }
}